From patchwork Tue May 18 14:43:34 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 12264941 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26936C43460 for ; Tue, 18 May 2021 14:43:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 08D50610A8 for ; Tue, 18 May 2021 14:43:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236482AbhEROpG (ORCPT ); Tue, 18 May 2021 10:45:06 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:29000 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236137AbhEROpF (ORCPT ); Tue, 18 May 2021 10:45:05 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1621349027; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=SnOgIuG0QI+D7+cp//iQj6D3t7PXPlfIr3EDmLUD8cw=; b=WNsxYLOrvagJF5/1NSYAbRwqFEKmLT4o6qT4fAKFEQo6Qa5/SyPcmG7CEtzPNT9XMNOATW DpSEaTAfXScUxAwYNj27LqEpfFdVwbvvnMZ00Hc2mV6jrMAZAGe5DNw/I7AlbSGbyK5dm7 g6n4IBNQBUxgJrIm9hx2dNKNZD3jKs4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-333-WW7pL-ltMkez6h8FlYudqw-1; Tue, 18 May 2021 10:43:44 -0400 X-MC-Unique: WW7pL-ltMkez6h8FlYudqw-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 327C9188E3C1; Tue, 18 May 2021 14:43:43 +0000 (UTC) Received: from vitty.brq.redhat.com (unknown [10.40.193.194]) by smtp.corp.redhat.com (Postfix) with ESMTP id B22671349A; Tue, 18 May 2021 14:43:40 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org, Paolo Bonzini Cc: Sean Christopherson , Wanpeng Li , Jim Mattson , Maxim Levitsky , Kechen Lu , linux-kernel@vger.kernel.org Subject: [PATCH v2 0/5] KVM: x86: hyper-v: Conditionally allow SynIC with APICv/AVIC Date: Tue, 18 May 2021 16:43:34 +0200 Message-Id: <20210518144339.1987982-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Changes since v1 (Sean): - Use common 'enable_apicv' variable for both APICv and AVIC instead of adding a new hook to 'struct kvm_x86_ops'. - Drop unneded CONFIG_X86_LOCAL_APIC checks from VMX/SVM code along the way. Original description: APICV_INHIBIT_REASON_HYPERV is currently unconditionally forced upon SynIC activation as SynIC's AutoEOI is incompatible with APICv/AVIC. It is, however, possible to track whether the feature was actually used by the guest and only inhibit APICv/AVIC when needed. The feature can be tested with QEMU's 'hv-passthrough' debug mode. Note, 'avic' kvm-amd module parameter is '0' by default and thus needs to be explicitly enabled. Vitaly Kuznetsov (5): KVM: SVM: Drop unneeded CONFIG_X86_LOCAL_APIC check for AVIC KVM: VMX: Drop unneeded CONFIG_X86_LOCAL_APIC check from cpu_has_vmx_posted_intr() KVM: x86: Use common 'enable_apicv' variable for both APICv and AVIC KVM: x86: Invert APICv/AVIC enablement check KVM: x86: hyper-v: Deactivate APICv only when AutoEOI feature is in use arch/x86/include/asm/kvm_host.h | 5 ++++- arch/x86/kvm/hyperv.c | 27 +++++++++++++++++++++------ arch/x86/kvm/svm/avic.c | 16 +++++----------- arch/x86/kvm/svm/svm.c | 24 +++++++++++++----------- arch/x86/kvm/svm/svm.h | 2 -- arch/x86/kvm/vmx/capabilities.h | 4 +--- arch/x86/kvm/vmx/vmx.c | 2 -- arch/x86/kvm/x86.c | 9 ++++++--- 8 files changed, 50 insertions(+), 39 deletions(-)